Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.002 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'interpreter': 0.04; 'subject:Python': 0.05; 'called.': 0.09; 'garbage': 0.09; 'references.': 0.09; 'cc:addr:python-list': 0.10; '__del__': 0.16; 'called,': 0.16; 'collected.': 0.16; 'cyclic': 0.16; 'dummy': 0.16; 'early.': 0.16; 'run.': 0.16; 'wrote:': 0.17; 'thu,': 0.17; 'feb': 0.19; 'module': 0.19; 'putting': 0.20; 'sorry,': 0.22; 'posted': 0.22; 'cc:2**0': 0.23; 'cc:no real name:2**0': 0.24; 'cc:addr:python.org': 0.25; 'header:In-Reply-To:1': 0.25; 'message-id:@mail.gmail.com': 0.27; 'chris': 0.28; 'cycles': 0.29; 'necessary,': 0.29; 'probably': 0.29; 'class': 0.29; 'stuff': 0.30; 'gets': 0.32; "aren't": 0.33; 'that,': 0.34; 'received:google.com': 0.34; 'pm,': 0.35; 'received:209.85.220': 0.35; 'received:209.85': 0.35; 'but': 0.36; "wasn't": 0.36; 'method': 0.36; 'too': 0.36; 'quite': 0.37; 'received:209': 0.37; 'subject:: ': 0.38; 'some': 0.38; 'called': 0.39; 'your': 0.60; 'different': 0.63; '2013': 0.84; 'trick,': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=xgobgWuKa7c3OUfUDvl3toYaJxK8oOQd77kx0mOxBo8=; b=0EDw3K3P5hdmMuYeC13ji0nptNAZeSd/eOH0ndIIbkXFjSDYS/jGNxR6jdIyjVweKS W8x7SfDD8iCz7/lTzqoMvO/W70WLvW5nDyDkB6wKLqvgwt59A9vpf9kUgh7T6cWJPEtC XXwNEF2xVEnW1HpCXm+jEgEbQ0uLNmSZJxQjVOLKhTnfLhE2z12tXI2XCgkok2l+a4WK Qfq6hMqnOAARRpiWdzB/5l0Pd9x601liOm30x/fLisGxNxlQUQhhAkXV0yjayqwh0S6C mtlbUu2m+HnDJMsDbtLpWYVkMTRkmHFn4F9yWBJWNwq4IvfQOol5wUrsZoDxN1fyB9HV o1jQ== X-Received: by 10.220.151.144 with SMTP id c16mr2835899vcw.18.1362072823711; Thu, 28 Feb 2013 09:33:43 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: <512f8aa9$0$30001$c3e8da3$5496439d@news.astraweb.com> From: Devin Jeanpierre Date: Thu, 28 Feb 2013 12:33:02 -0500 Subject: Re: Speeding up Python's exit To: Chris Angelico Content-Type: text/plain; charset=UTF-8 Cc: python-list@python.org X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 19 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1362072834 news.xs4all.nl 6959 [2001:888:2000:d::a6]:32828 X-Complaints-To: abuse@xs4all.nl Path: csiph.com!usenet.pasdenom.info!news.franciliens.net!feed.ac-versailles.fr!nerim.net!novso.com!newsfeed.xs4all.nl!newsfeed1.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Xref: csiph.com comp.lang.python:40145 On Thu, Feb 28, 2013 at 12:31 PM, Devin Jeanpierre wrote: > On Thu, Feb 28, 2013 at 12:06 PM, Chris Angelico wrote: >> Is it any different if you create a deliberate reference loop and then >> stuff it into some module somewhere? That would force it to be kept >> until interpreter shutdown, and then a cyclic garbage collection after >> that, which quite probably would be never run. A stupid trick, >> perhaps, but it might work; I tested it with a dummy class with a >> __del__ method and it wasn't called. Putting it into some other module >> may not be necessary, but I don't know what happens with the >> interactive interpreter and what gets freed up when. > > __del__ is never called for cyclic references. Sorry, I posted too early. Not only is __del__ never called, but __del__ is the reason the cycles aren't collected. I don't know if your trick will work without __del__. -- Devin